After a typhoon, Granny Lin rescues an injured little white dragon at the Chaotic Reef Beach, hiding him in the firewood shed and healing him with medicinal mud. The little white dragon turns into a scholar and gifts a tide-calling conch, and a spiritual spring cures Granny's chronic ailment. Her son Lin Daqiang and daughter-in-law Cuihua steal the conch, forcing Granny to sign a contract severing family ties, and sweep her out the door in the freezing winter. The conch sprays poisonous mud at the Treasure Pavilion, ruining the couple completely. The Old Dragon King teaches Granny the skill of listening to tides and distinguishing fish, leading poor neighbors like Old Man Sun and Widow Wang to cast nets for a bountiful harvest, establishing rules to lead the whole village to prosperity. Daqiang and his wife, jealous and resentful, falsely accuse Granny of sorcery, and a true dragon manifests in the official court to trace back the truth. Granny strikes the bluestone three times to break the family bond, Daqiang repents and is punished, and Cuihua is exiled. Granny passes down skills to help people, the fishing village prospers, and her good name flows far.